Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 194 insertions, 0 deletions

diff --git a/include/unotools/digitgroupingiterator.hxx b/include/unotools/digitgroupingiterator.hxx
new file mode 100644
index 000000000..7206f72f1
--- /dev/null
+++ b/include/unotools/digitgroupingiterator.hxx
@@ -0,0 +1,194 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_UNOTOOLS_DIGITGROUPINGITERATOR_HXX
+#define INCLUDED_UNOTOOLS_DIGITGROUPINGITERATOR_HXX
+
+#include <com/sun/star/uno/Sequence.hxx>
+#include <sal/log.hxx>
+
+namespace utl {
+
+/** Iterator to be used with a digit grouping as obtained through
+    LocaleDataWrapper::getDigitGrouping().
+
+    The iterator advances over the digit groupings, returning the number of
+    digits per group. If the last group was encountered the iterator will
+    always return the last grouping.
+
+    Grouping values are sanitized to be >= 0, even if originally signed
+    sal_Int32.
+
+    Usage example with a string buffer containing a decimal representation of
+    an integer number. Note that of course this loop could be optimized to not
+    count single characters but hunks of groups instead using the get() method,
+    this is just for illustrating usage. Anyway, for double values it is highly
+    more efficient to use ::rtl::math::doubleToString() and pass the grouping
+    sequence, instead of using this iterator and inserting characters into
+    strings.
+
+    DigitGroupingIterator aGrouping(...)
+    sal_Int32 nCount = 0;
+    sal_Int32 n = aBuffer.getLength();
+    // >1 because we don't want to insert a separator if there is no leading digit.
+    while (n-- > 1)
+    {
+        if (++nCount >= aGrouping.getPos())
+        {
+            aBuffer.insert( n, cSeparator);
+            nGroupDigits = aGrouping.advance();
+        }
+    }
+
+ */
+
+class DigitGroupingIterator
+{
+    const css::uno::Sequence< sal_Int32 > maGroupings;
+
+    sal_Int32   mnGroup;        // current active grouping
+    sal_Int32   mnDigits;       // current active digits per group
+    sal_Int32   mnNextPos;      // position (in digits) of next grouping
+
+    void setInfinite()
+    {
+        mnGroup = maGroupings.getLength();
+    }
+
+    bool isInfinite() const
+    {
+        return mnGroup >= maGroupings.getLength();
+    }
+
+    sal_Int32 getGrouping() const
+    {
+        if (mnGroup < maGroupings.getLength())
+        {
+            sal_Int32 n = maGroupings[mnGroup];
+            SAL_WARN_IF( n < 0, "unotools.i18n", "DigitGroupingIterator::getGrouping: negative grouping");
+            if (n < 0)
+                n = 0;      // sanitize ...
+            return n;
+        }
+        return 0;
+    }
+
+    void setPos()
+    {
+        // someone might be playing jokes on us, so check for overflow
+        if (mnNextPos <= SAL_MAX_INT32 - mnDigits)
+            mnNextPos += mnDigits;
+    }
+
+    void setDigits()
+    {
+        sal_Int32 nPrev = mnDigits;
+        mnDigits = getGrouping();
+        if (!mnDigits)
+        {
+            mnDigits = nPrev;
+            setInfinite();
+        }
+        setPos();
+    }
+
+    void initGrouping()
+    {
+        mnDigits = 3;       // just in case of constructed with empty grouping
+        mnGroup = 0;
+        mnNextPos = 0;
+        setDigits();
+    }
+
+    DigitGroupingIterator( const DigitGroupingIterator & ) = delete;
+    DigitGroupingIterator & operator=( const DigitGroupingIterator & ) = delete;
+
+public:
+
+    explicit DigitGroupingIterator( const css::uno::Sequence< sal_Int32 > & rGroupings )
+        : maGroupings( rGroupings)
+    {
+        initGrouping();
+    }
+
+    /** Advance iterator to next grouping. */
+    DigitGroupingIterator & advance()
+    {
+        if (isInfinite())
+            setPos();
+        else
+        {
+            ++mnGroup;
+            setDigits();
+        }
+        return *this;
+    }
+
+    /** Obtain current grouping. Always > 0. */
+    sal_Int32 get() const
+    {
+        return mnDigits;
+    }
+
+    /** The next position (in integer digits) from the right where to insert a
+        group separator. */
+    sal_Int32 getPos() const
+    {
+        return mnNextPos;
+    }
+
+    /** Reset iterator to start again from the right beginning. */
+    void reset()
+    {
+        initGrouping();
+    }
+
+    /** Create a sequence of bool values containing positions where to add a
+        separator when iterating forward over a string and copying digit per
+        digit. For example, for grouping in thousands and nIntegerDigits==7 the
+        sequence returned would be {1,0,0,1,0,0,0} so the caller would add a
+        separator after the 1st and the 4th digit. */
+    static css::uno::Sequence< sal_Bool > createForwardSequence(
+            sal_Int32 nIntegerDigits,
+            const css::uno::Sequence< sal_Int32 > & rGroupings )
+    {
+        if (nIntegerDigits <= 0)
+            return css::uno::Sequence< sal_Bool >();
+        DigitGroupingIterator aIterator( rGroupings);
+        css::uno::Sequence< sal_Bool > aSeq( nIntegerDigits);
+        sal_Bool* pArr = aSeq.getArray();
+        for (sal_Int32 j = 0; --nIntegerDigits >= 0; ++j)
+        {
+            if (j == aIterator.getPos())
+            {
+                pArr[nIntegerDigits] = true;
+                aIterator.advance();
+            }
+            else
+                pArr[nIntegerDigits] = false;
+        }
+        return aSeq;
+    }
+};
+
+} // namespace utl
+
+#endif // INCLUDED_UNOTOOLS_DIGITGROUPINGITERATOR_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */